Fuel injection pump



FUEL' INJECTION PUMP Filed Jan. 29, 1958 4 Sheets-Sheet 1 I N VENTORS\A/ALDEMAE o. B\SCHOFF HANS HOGEMAN 6 ZATTOE/VEY.

1960 w. o. BISCHOFF ET AL 2,965,087

FUEL INJECTION PUMP 4 Sheets-Sheet 2 Filed Jan. 29, 1958 INVENTORS.WALDEMA'E o. IBlSCHOF-F' HANS HOGEMAN ATTORNEY.

Dec. 20, 1960 w. o. BISCHOFF ET AL 2,965,087

FUEL INJECTION PUMP Filed Jan. 29, 1958 4 Sheets-Sheet 3 PATH ore}; OFPLUNGER F'ILL 'FOETS.

CAMSHAFT DEGEEE$ iPLUNGEE ROTATION INVENTORS. \A/ALDEMAE O.BISCHOFF HANSHOG ELMAN ATTOP/VEK Dec. 20, 1960 w. o. BISCHOFF ETAL 2,965,087

FUEL. INJECTION PUMP Filed Jan. 29, 1958 4 Sheets-Sheet 4 INVENTORS. WALD E MAE O- BISCHOFF HANS HOGEMAN A TTOPNEY.

FUEL INJECTION PUMP Waldemar O. Bischoif, Holyoke, and Hans Hogeman,Longmeadow, Mass., assignors to American Bosch Arma Corporation, acorporation of New York Filed Jan. 29, 1958, Ser. No. 711,835

10 Claims. (Cl. 123-140) This invention relates to fuel injectionapparatus for internal combustion engines and has particular referenceto a new and improved form of fuel injection apparatus adapted to beconnected to and driven by the engine and which apparatus is relativelysimple, compact and economical in construction and eflicient inoperation.

An object of the invention is to provide a new and improved fuelinjection apparatus of the fuel distributor type wherein a singlepumping and distributing member is utilized for pumping fuel anddistributing it to a plurality of engine cylinders or combustionchambers, which apparatus is adapted for supplying fuel for small, highspeed engines and which apparatus is relatively simple, compact andeconomical in construction and efficient in operation.

Another object is to provide an apparatus of the type set forth in whichthe timing of injection by the pump may be varied.

Another object is to provide a device of the type set forth in which theapparatus may be adapted for driving the pump at either engine speed orone half engine speed, as desired.

Another object is to provide a device of the type set forth having newand improved fuel supply pump means.

Another object is to provide a device of the type set forth wherein agovernor may be associated directly with the pump and, if desired, maybe utilized for operating the fuel supply pump.

Another object of the invention is to provide a new and improved fuelinjection pump of the type set forth wherein the means for supplyingfuel to the pumping chamber is constructed so that fuel is drawn intothe pumping chamber during the complete suction stroke of the pumpingmember.

Referring to the drawings:

Fig. l is a longitudinal sectional view of a fuel injection apparatusembodying the invention;

Fig. 2 is a sectional view taken on line 2--2 of Fig. 1, looking in thedirection of the arrows;

Fig. 3 is a sectional view taken on line 3--3 of Fig. 1, looking in thedirection of the arrows;

Fig. 4 is a sectional view taken on line 4-4 of Fig. 1, looking in thedirection of the arrows;

Fig. 5 is a diagrammatic view illustrating the operation of the fillingports for supplying fuel to the pumping chamber of the apparatus; and

Fig. 6 is a perspective view illustrating the cam adjusting arrangement.

Referring more particularly to the drawings wherein similar referencecharacters designate corresponding parts throughout, the apparatus shownembodying the invention comprises a casing 10 in which is journalled adrive shaft 11 in the bearings 12 and 13, and which drive shaft 11 isadapted to be operatively connected to the engine, whereby it is driventhereby.

On the end of drive shaft 11 in casing 10 is mounted a spur gear 14.

The drive shaft 11 carries the cam 15, the number of tates Patent lobeson the cam depending upon the speed at which the pump is to be driven,for example, when the drive shaft 11 is connected to a four-stroke cycleengine and adapted to operate at half engine speed, the number of lobeson the cam is equal to the number of outlets in the pump and where thedrive shaft 11 is adapted to be driven at engine speed, the cam isprovided with one half the number of lobes as the pump has outlets. Thedrive shaft 11 has means adjacent its end opposite spur gear 14 forconnection to an engine.

The fuel injection pump includes the pump head 16, which fits into arecess 17 in the portion 10a of housing 10.

The pump head 16 has the bore 18 therethrough, the outer end of which isclosed by a threaded plug or the like 19 and a plurality of outlets 20are provided, one for each cylinder or combustion chamber adapted toreceive fuel from the injection pump, and such outlets 20 are connectedto bore 18 by ducts or passages 21.

The hydraulic head 16 is retained in position in the casing 10a by meansof the flange member 22, which is secured to casing 10a by bolts orother suitable means.

The hydraulic head 16 is provided with a peripheral recess or groove 23which, together with wall 10a of the housing, forms a sump to which fuelis supplied through pipe 24, which has its end 25 extending out of thecasing 10 and is adapted to be connected to a suitable source of fuelsuch as a pipe connected to fuel supply pump 26.

Fuel is supplied to the bore 18 from sump 23 by means of inlet or fillports or ducts 27 which may be of any suitable number, which may be oneport for each engine cylinder or any multiple thereof. Hydraulic head 16is also provided with spill sump 28.

The plunger or pumping and distributing member 29 is positioned in bore18 in the hydraulic head 16 and member 29 is provided with the bore 30in the end thereof adjacent plug 19 and, at its opposite end, member 29is adapted to engage tappet 31 and to be held in engagement therewith byspring 32 which engages spring seat 33 and which spring seat 33 engagesthe head on the member 29 and retains it in engagement with tappet 31.Tappet roller 34 is provided between cam 15 and tappet 31.

Member 29 is provided with radial ports 35, one of which is provided foreach fill port means 27 or any multiple thereof for supplying fuel fromsaid ducts 27 to the pumping chamber which is the upper end of bore 18through bore 30 in the member 29 whereby bore 30 will be in commnicationwith fill ports 27 during substantially the complete suction stroke ofmember 29 as shown in Fig. 5. Adjacent to ports 35, member 29 is alsoprovided with a peripheral groove 36 which communicates with ports 35and whereby during the latter portion of the suction stroke of member 29groove 36 communicates with all of the fill ports 27. With this fillingsystem the movement or stroke of member 29 may be much less than wouldotherwise be necessary thereby providing a simpler and more compactapparatus, which is accordingly more economical.

Fill ports 27 are so positioned that during the injection stroke ofmember 29, ports 27 do not communicate with ports 35. During the earlypart of the injection stroke groove 36 and port 36a is in communicationwith fill ports 27 and permits a spill back of fuel thereby preventingthe Fuel pumped by the member 29 in bore 18 passes through port 36a andgroove 36 to duct or passage 42, delivery valve 41 and port means 40 todistributing groove means 43 on the periphery of member 29, whichdistribut ing groove 43 is adapted to communicate with each of outletpassages 21 successively upon rotation of member 29 to therebydistribute fuel to each of outlets 20 in succession upon rotation ofmember 29.

In order that the member 29 be rotated to align distributing port 43with each of outlet ducts 21, the face gear 44 is provided adjacent theend of member 29 which engages the tappet 31, and face gear 44 isconnected to member 29 by means of pin 45a or other suitable means.

Face gear 44 is adapted to be driven upon rotation of drive shaft 11 andspur gear 14 through the pinion 45, which is interposed between gears 14and 44, and in those constructions embodying the governor as is shown inFig. l, the pinion 45 may be mounted on the governor shaft 46 forsimultaneously driving the governor shaft and simultaneously operatingthe fuel supply pump where the fuel supply pump is operatively connectedto the end of the governor shaft, as in the construction shown inFig. 1. Supply pump 26 is preferably of the flexible impeller type suchas shown in Patent No. 2,189,356 and is mounted on governor shaft 46 andis driven thereby.

The governor arrangement is a centrifugal type governor adapted to beactuated through the centrifugal force of governor weights 47, which areadapted to actuate governor sleeve 48 which is connected to governorlever 71 which is connected to linkage 49 whereby the position of fuelmetering sleeve 39 may be adjusted through shaft 50 and eccentric 51.

The governor weights 47 are pivotally mounted on spider 47a and, as willbe seen from Fig. 4, three such weights are preferably provided andmember 47a is connected to governor shaft 46 by being keyed theretothrough the fiat engaging edges 4712 which engage fiat edges on theopposite sides of shaft 46.

The timing of injection by the pump may be varied by varying therelationship of the cam 15 and member 29. This is accomplished byproviding a cam 52 on operating lever shaft 53 with the cam 52 engagingthe end 54 of cam shifting shaft 55, which is positioned in bore 56 inshaft 11 at the end thereof adjacent gear 14 which is keyed on hub 57 bymeans of key 58 whereby gear 14 will rotate upon rotation of drive shaft11.

Drive shaft 11 has the slot or opening 58a therethrough, and the end 59of shaft 55 extends into the slot or opening 58a and is connected toradial actuating members 69 which are connected to shifting member 61,and which member has the helical grooves or slots 62 in its outersurface adapted to receive helical splines or the like 63 on the innersurface of cam member 64 whereby the phase relation of lobes 65 andshaft 11 may be varied. The cam 15 is so mounted that it cannot moveaxially and, therefore, axial motion of ring 61 causes cam 15 to rotaterelative to shaft 11.

The spring 66 engages the side or edge surface of adjusting member 61and opposes the movement of said member by cam 52.

It will be seen that any change in position of the operating lever andshaft 53 will simultaneously change the phase relation between adjustingmember 61 and cam 64 to thereby change the phase relationship betweenthe cam lobes 65 and the plunger 29 to vary the timing of injection bythe pump.

The maximum speed of the pump is controlled through engagement ofmaximum speed lever 68a with maximum speed stop 68, which is adjustable.

The idle control is provided by spring 69, which is connected to idleadjusting screw 70 which adjusts the position of spring 69 relative togovernor lever 71 and this spring 69 is adapted to engage lever 71 tocontrol the engine idle fuel quantity.

Full load adjusting screw 72 is provided for controlling the desiredfull load fuel quantity and contains torque control screw 73, which isresiliently urged into engagement with lever 71 at full load position byspring 74 which allows torque control screw 73 to move slightly beyondfull load position for providing the desired torque backup. The screw 72is screwed into place to retain the unit in full load fuel position andthen the torque control screw 73 is adjusted by adjusting screw 73 todesired position for the desired torque backup.

The pump shown is adapted for one half engine speed operation. In orderto adapt the pump to engine speed operation it is only necessary tochange the cam 15 to a cam having one half the number of lobes ascompared with the pump outlets and also to change the gears 14 and 45 toprovide the proper speed ratios.

From the foregoing it will be seen that we have provided new andimproved means for obtaining all of the objects and advantages of theinvention.

We claim:

1. In a fuel injection pump for an internal combustion engine, said pumpbeing adapted to be operatively connected to an engine and driventhereby, said pump comprising a housing, a drive shaft journalled insaid housing, said shaft having means adjacent one end for operativeconnection to an engine and said drive shaft having a spur gear adjacentthe opposite end thereof, a cam carried by said drive shaft, a hydraulichead in said casing and having a bore in alignment with said cam, aplurality of outlets and a plurality of inlet ports communicating withsaid bore, a pumping and distributing member mounted for reciprocationand rotation in said bore, a tappet between said cam and said pumpingand distributing member and adapted to engage said cam for effecting thepumping stroke thereof, a spring operatively connected to said pumpingand distributing member for effecting the return or suction stroke ofsaid pumping and distributing member, a face gear surrounding saidpumping and distributing member and operatively connected thereto foreffecting rotation thereof, a pinion between said face gear and saidspur gear and meshing therewith for operatively connecting said gears,said hydraulic head having a sump communicating with said fill ports,said pumping and distributing member having a bore at the end thereofopposite said face gear, bypass port means communicating with said borein said pumping and distributing member and adjustable means forcontrolling the bypassing of fuel through said bypass port means, fillport means in said pumping and distributing member and adapted tocommunicate with said fill ports in said hydraulic head for supplyingfuel to said bore in said pumping and distributing member, saidhydraulic head having a plurality of outlets and fuel distributing meansin said pumping and distributing member for supplying fuel to each ofsaid outlets successively upon rotation of said pumping and distributingmember, said fill ports in said pumping and distributing member beingintermediate said distributing means and said bypass port means and aperipheral groove in said pumping and distributing member andcommunicating with said fill ports whereby fuel will be supplied throughsaid fill ports to said bore in said pumping and distributing memberthroughout substantially the entire suction stroke of said pumping anddistributing member, and a governor shaft journalled in said housingparallel to said drive shaft, said governor shaft carrying said piinonand a centrifugal governor carried by said governor shaft andoperatively connected to said spill port control means. i

2. In a fuel injection pump for an internal combustion engine, said pumpbeing adapted to be operatively connected to an engine and driventhereby, said pump comprising a housing, a drive shaft journalled insaid housing, said shaft having means adjacent one end for operativeconnection to an engine and said drive shaft having a spur gear adjacentthe opposite end thereof, a cam carried by said. drive. shaf a ydraulieh ad in. S

casing and having a bore in alignment with said cam, a plurality ofoutlets and a plurality of inlet ports communicating with said bore, apumping and distributing member mounted for reciprocation and rotationin said bore, a tappet between said cam and said pumping anddistributing member and adapted to engage said cam for effecting thepumping stroke thereof, a spring operatively connected to said pumpingand distributing member for effecting the return or suction stroke ofsaid pumping and distributing member, a face gear surrounding saidpumping and distributing member and operatively connected thereto foreffecting rotation thereof, a pinion between said face gear and saidspur gear and meshing therewith for operatively connecting said gears,said hydraulic head having a sump communicating with said fill ports,said pumping and distributing member having a bore at the end thereofopposite said face gear, bypass port means communicating with said borein said pumping and distributing member and adjustable means forcontrolling the bypassing of fuel through said bypass port means, fillport means in said pumping and distributing member and adapted tocommunicate with said fill ports in said hydraulic head for supplyingfuel to said bore in said pumping and distributing member, saidhydraulic head having a plurality of outlets and fuel distributing meansin said pumping and distributing member for supplying fuel to each ofsaid outlets successively upon rotation of said pumping and distributingmember, said fill ports in said pumping and distributing member beingintermediate said distributing means and said bypass port means and aperipheral groove in said pumping and distributing member andcommunicating with said fill ports whereby fuel will be supplied throughsaid fill ports to said bore in said pumping and distributing memberthroughout substantially the entire suction stroke of said pumping anddistributing member, and a governor shaft journalled in said housingparallel to said drive shaft, said governor shaft carrying said pinionand a centrifugal governor carried by said governor shaft andoperatively connected to said spill port control means, and a supplypump carried by said casing and operatively connected to said governorshaft and fuel passage means from said supply pump to said fill ports insaid hydraulic head.

3. In a fuel injection pump for supplying fuel to an internal combustionengine, said pump being adapted to be operatively connected to theengine and driven thereby, said pump comprising a casing, a two partdrive shaft extending into said casing and adapted to be operativelyconnected to an engine, cam means carried by one part of said driveshaft, a hydraulic head having a bore aligned with said cam means, saidhydraulic head having fill ports for supplying fuel to said bore andoutlets for delivering fuel, said fill ports and outlets communicatingwith said bore, a pumping and distributing member in said bore in saidhydraulic head and mounted for reciprocation and rotation in said borein said head, gear means carried by the other part of said drive shaftand connecting said drive shaft and said pumping and distributing memberfor effecting rotation of said pumping and distributing member uponrotation of said drive shaft to thereby effect distribution of fuel,said pumping and distributing member being adapted to be actuated bysaid cam means, said pumping and distributing member having fueldistributing means for distributing fuel to each of said outletssuccessively upon rotation of said pumping and distributing member andmeans for varying the relationship between said parts of said driveshaft to thereby vary the relationship between said cam means and saidpumping and distributing member to vary the timing of injection by thepump.

4. In a fuel injection pump for supplying fuel to an internal combustionengine, said pump being adapted to be operatively connected to theengine and driven thereby, said pump comprising a casing, a two partdrive shaft extending into said casing and adapted to be operativelyconnected to an engine, cam means carried by one part of said driveshaft, a hydraulic head having a bore aligned with said cam means, saidhydraulic head having fill ports for supplying fuel to said bore andoutlets for delivering fuel, said fill ports and outlets communicatingwith said bore, a pumping and distributing member in said bore in saidhydraulic head and mounted for reciprocation and rotation in said borein said head, gear means carried by the other part of said drive shaftand connecting said drive shaft and said pumping and distributing memberfor effecting rotation of said pumping and distributing member uponrotation of said drive shaft to thereby effect distribution of fuel,said pumping and distributing member being adapted to be actuated bysaid cam means, said pumping and distributing member having fueldistributing means for distributing fuel to each of said outletssuccessively upon rotation of said pumping and distributing member andmeans for varying the relationship between said parts of said driveshaft to thereby vary the relationship between said cam means and saidpumping and distributing member to vary the timing of injection by thepump, said means comprising means for shifting the position of said cammeans relative to said drive shaft.

5. In a fuel injection pump for supplying fuel to an internal combustionengine, said pump being adapted to be operatively connected to theengine and driven thereby said pump comprising a casing, a two partdrive shaft extending into said casing and adapted to be operativelyconnected to an engine, cam means carried by one part of said driveshaft, a hydraulic head having a bore aligned with said cam means, saidhydraulic head having fill ports for supplying fuel to said bore andoutlets for delivering fuel, said fill ports and outlets communicatingwith said bore, a pumping and distributing member in said bore in saidhydraulic head and mounted for reciprocation and rotation in said borein said head, gear means carried by the other part of said drive shaftand connecting said drive shaft and said pumping and distributing memberfor effecting rotation of said pumping and distributing member uponrotation of said drive shaft to thereby effect distribution of fuel,said pumping and distributing member being adapted to be actuated bysaid cam means, said pumping and distributing member having fueldistributing means for distributing fuel to each of said outletssuccessively upon rotation of said pumping and distributing member andmeans for varying the relationshilp between said parts of said driveshaft to thereby vary the relationship between said cam means and saidpumping and distributing member to vary the timing of injection by thepump, and means for rotating said pumping and distributing member andcomprising a face gear operatively connected to said member and a pinionmeshing with said gear means carried by said drive shaft and with saidface gear.

6. In a fuel injection pump for supplying fuel to an internal combustionengine, said pump being adapted to be operatively connected to theengine and driven thereby, said pump comprising a casing, a two partdrive shaft extending into said casing and adapted to be operativelyconnected to an engine, cam means carried by one part of said driveshaft, a hydraulic head having a bore aligned with said cam means, saidhydraulic head having fill ports for supplying fuel to said bore andoutlets for delivering fuel, said fill ports and outlets communicatingwith said bore, a pumping and distributing member in said bore in saidhydraulic head and mounted for reciprocation and rotation in said borein said head, gear means carried by the other part of said drive shaftand connecting said drive shaft and said pumping and distributing memberfor effecting rotation of said pumping and distributing member uponrotation of said drive shaft to thereby effect distribution of fuel,said pumping and distributing member being adapted to be actuated bysaid cam means, said pumping and distributing member having fueldistributing means for distributing fuel to each of said outletssuccessively upon rotation of said pumping and distributing member andmeans for varying the relationship between said parts of said driveshaft to thereby vary the relationship between said cam means and saidpumping and distributing member to vary the timing of injection by thepump, and means for rotating said pumping and distributing member andcomprising a face gear operatively connected to said member and a spurgear carried by said drive shaft and operatively connected to said facegear, a governor shaft journalled in said casing, a pinion carried bysaid shaft and meshing with said face gear and said spur gear andcentrifugally actuated governor means carried by said governor shaft.

7. In a fuel injection pump for supplying fuel to an internal combustionengine, said pump being adapted to be operatively connected to theengine and driven thereby, said pump comprising a casing, a two partdrive shaft extending into said casing and adapted to be operativelyconnected to an engine, cam means carried by one part of said driveshaft, a hydraulic head having a bore aligned with said cam means, saidhydraulic head having fill ports for supplying fuel to said bore andoutlets for delivering fuel, said fill ports and outlets communicatingwith said bore, a pumping and distributing member in said bore in saidhydraulic head and mounted for reciprocation and rotation in said borein said head, gear means carried by the other part of said drive shaftand connecting said drive shaft and said pumping and distributing memberfor effecting rotation of said pumping and distributing member uponrotation of said drive shaft to thereby effect distribution of fuel,said pumping and distributing member being adapted to be actuated bysaid cam means, said pumping and distributing member having fueldistributing means for distributing fuel to each of said outletssuccessively upon rotation of said pumping and distributing member andmeans for varying the relationship between said parts of said driveshaft to thereby vary the relationship between said cam means and saidpumping and distributing member to vary the timing of injection by thepump, and means for rotating said pumping and distributing member andcomprising a face gear operatively connected to said member and a spurgear carried by said drive shaft and operatively connected to said facegear, a governor shaft journalled in said casing, a pinion carried bysaid shaft and meshing with said face gear and said spur gear andcentrifugally actuated governor means carried by said governor shaft, asupply pump carried by said casing and operatively connected to saidgovernor shaft and adapted to be driven thereby and an adjusting memberextending into the part of said drive shaft carrying said spur gear forvarying the relationship between the parts of said drive shaft.

8. In a fuel injection pump for an internal combustion engine, said pumpbeing adapted to be operatively connected to an engine and driventhereby, said pump having a housing, a drive shaft journalled in saidhousing, said drive shaft having means adjacent one end for operativeconnection to an engine and having a gear adjacent the opposite endthereof, a cam carried by said drive shaft, a hydraulic head in saidcasing and having a bore in alignment with said cam, said housing havinga plurality of outlet ports communicating with said bore and adapted todistribute fuel to the combustion chambers of an engine successively, apumping and distributing member mounted for reciprocation and rotationin said bore, a tappet between said cam and said pumping anddistributing member and adapted to engage said cam for effecting thepumping stroke thereof, a spring operatively connected to said pumpingand distributing member for effecting the suction stroke thereof, a facegear surrounding said pumping and distributing member and operativelyconnected thereto for effecting rotation thereof, a governor shaft inspaced parallel relation with said drive shaft,

a centrifugal governor operatively connected to said governor shaft, apinion on said governor shaft meshing with said face gear and said gearon said drive shaft and operatively connecting said gears, where uponrotation of said drive shaft rotation will be effected of said governorshaft and said pumping and distributing member, said hydraulic headhaving inlet port means communicating with said bore for supplying fuelthereto, said pumping and distributing member having a fuel passage andbypass port means communicating with said fuel passage, adjustable meansfor controlling the bypassing of fuel through said bypass port means tothereby control the fuel quantity delivered by said pump, anddistributing means on said pumping and distributing member andcommunicating with said bore for supplying fuel to each of said outletssuccessively upon rotation of said pumping and distributing member.

9. In a fuel injection pump for an internal combustion engine, said pumpbeing adapted to be operatively connected to an engine and driventhereby, said pump having a housing, a drive shaft journalled in saidhousing, said drive shaft having means adjacent one end for operativeconnection to an engine and having a spur gear adjacent the opposite endthereof, a cam carried by said drive shaft, a hydraulic head in saidcasing and having a bore in alignment with said cam, said housing havinga plurality of outlet ports communicating with said bore and adapted todistribute fuel to the combustion chambers of an engine successively, apumping and distributing member mounted for reciprocation and rotationin said bore, a tappet between said cam and said pumping anddistributing member and adapted to engage said cam for effecting thepumping stroke thereof, a spring operatively connected to said pumpingand distributing member for effecting the suction stroke thereof, a facegear surrounding said pumping and distributing member and operativelyconnected thereto for effecting rotation thereof, a governor shaft inspaced parallel relation with said drive shaft, a centrifugal governoroperatively connected to said governor shaft, a pinion on said governorshaft meshing with said face gear and said gear on said drive shaft andoperatively connecting said gears, where upon rotation of said driveshaft rotation will be effected of said governor shaft and said pumpingand distributing member, said hydraulic head having inlet port meanscommunicating with said bore for supplying fuel thereto, said pumpingand distributing member having a fuel passage and bypass. port meanscommunicating with said fuel passage, adjust-r able means forcontrolling the bypassing of fuel through said bypass port means tothereby control the fuel quantity delivered by said pump, anddistributing means on said pumping and distributing member and communi-.eating with said bore for supplying fuel to each of said outletssuccessively upon rotation of said pumping and distributing member.

10. In a fuel injection pump for an internal combustion engine, saidpump being adapted to be operatively connected to an engine and driventhereby, said pump having a housing, a drive shaft journalled in saidhousing, said drive shaft having means adjacent one end for operativeconnection to an engine and having a gear adjacent the opposite endthereof, a cam carried by said drive shaft, a hydraulic head in saidcasing and having a bore in alignment with said cam, said housing havinga plurality of outlet ports communicating with said bore and adapted todistribute fuel to the combustion chambers of an engine successively, apumping and distributing member mounted for reciprocation and rotationin said bore, a tappet between said cam and said pumping anddistributing member and adapted to engage said cam for effecting thepumping stroke thereof, a spring operatively connected to said pumpingand distributing member for effecting the suction stroke thereof, a gearsurrounding said pumping and distributing memberand operativelyconnected thereto. for effecting rotation thereof, a governor shaft inspaced parallel relation with said drive shaft, a centrifugal governoroperatively connected to said governor shaft, a pinion on said governorshaft meshing with said gear and said gear on said drive shaft andoperatively connecting said gears, where upon rotation of said driveshaft rotation Will be effected of said governor shaft and said pumpingand distributing member, said hydraulic head having inlet port meanscommunicating with said bore for supplying fuel thereto, said pumpingand distributing member having a fuel passage and bypass port meanscommunicating with said fuel passage, adjustable means for controllingthe bypassing of fuel through said bypass port means to thereby controlthe fuel quantity delivered 10 by said pump, and distributing means onsaid pumping and distributing member and communicating with said borefor supplying fuel to each of said outlets successively upon rotation ofsaid pumping and distributing member.

References Cited in the file of this patent UNITED STATES PATENTS1,736,242 Attendu Nov. 19, 1929 2,465,784 Berlyn et al Mar. 29, 19492,544,561 Meyer Mar. 6, 1951 2,699,766 Fodor et al. Jan. 18, 19552,746,443 Meyer May 22, 1956

